COSC  Grand Seiko  Wempe  Felurier 
Mechanicals 
COSC  Grand Seiko  Wempe 
Positions 
5 
6 
5 
Temperature [C] 
8, 23, 38 
8, 23, 38 
8, 23, 38 
Length [days] 
15 
17 
15 
Test [calibre/complete watch] 
Calibre 
Calibre (?) 
Complete watch 
Standard 
ISO 3159 
ISO 3158 
DIN 8319 
Year of standard 
2009 
1976 
2010 
Terms  Explanation 
Certificate No. 
Unique number of the rating certificate 
Caliber No. 
Code number of the movement 
Movement serial No. 
Unique number of the movement 
Case serial No. 
Unique number of the watch case 
Order of days of inspection 
Order of days of inspection 
Daily rates 
Measured loss or gain per day;expressed in seconds/day 
Variation of the daily rates 
Fluctuation of the daily rate under certain fixed conditions 
Positions 
This refers to resting positions which the watch movement 
Temperatures 
This refers to the temperature environment in which the watch 
Mean daily rate 
This refers to the mean value of 12 daily rate measurements 
Mean variation 
This refers to the mean value of the 6 differences 
Maximum variation 
This refers to the maximum value of the 6 differences 
Difference between 
This refers to the difference in daily rate between 
the mean daily rate and any individual rate 
of the daily rates measured over the first 12 days of tests and their mean value. It indicates how the daily rate changes depending on the resting positions of the watch movement expressed in seconds/day 
First variation of rate per 
This indicates the change in daily rate per degree Centigrade 
Second variation of rate per 
This indicates the change in daily rate per degree Centigrade 
Rateresumption 
This refers to the value obtained by subtracting the 
Date of inspection 
Description of the date when all the inspections 
Terms of Grand Seiko standard 
Unit  Standard 
Mean daily rate in different positions 
[s/d] 
3.0 / 5.0 
Mean variation 
[s/d] 
< 1.8 
Maximum variation 
[s/d] 
< 4.0 
Difference between flat and hanging position 
[s/d] 
6.0 / 8.0 
Greatest difference between the mean daily rate and any individual rate 
[s/d] 
< 8.0 
First variation of rate per 1C from 38 to 8 
[s/d/C] 
0.5 / 0.5 
Second variation of rate per 1C from 38 to 8 
[s/d] 
0.5 / 0.5 
Rateresumption 
[s/d] 
5.0 / 5.0 
Number of positions in inspection 

6 positions 
Condition of temperature in inspection 

8, 23, 38 C 
Total days of inspection 

17 days 
3U  6U  9U  12U  DU  BU 
3 fent  6 fent  9 fent  12 fent  Szlap fent  Szlap lent 
Mechanikus  Kvarc 
Mechanical  Quartz 
Mechanical 
Values  Remarks 
Average daily rate: 
4/+6 
this is the average rate over the first ten testing days. 
Mean variation 
2 
this figure shows if a watch tends to run fast or slow; 
Greatest variation 
5 
This is the largest difference between any two day's 
Difference between 
6/+8 
calculated by subtracting the average of the rates 
Largest variation 
10 
the largest difference between the mean daily rate 
Thermal variation: 
± 0.6 
the temperature error of the movement, 
Rate resumption: 
± 5 
figure obtained by subtracting the average mean 
Day 
Position  t[C]  Add. Test 
0 
6U  23  
1 
6U  23  
2 
6U  23  
3 
3U  23  
4 
3U  23  
5 
9U  23  
6 
9U  23  
7 
BU  23  
8 
BU  23  
9 
DU  23  
10 
DU  23  Mech. in op. 
11 
DU  8  
12 
DU  23  
13 
DU  38  
14 
6U  23  
15 
6U  23 
3U  6U  9U  12U  DU  BU 
3 fent  6 fent  9 fent  12 fent  Szlap fent  Szlap lent 
Quartz 
Value 
Average daily rate at 23 °C: 
± 0.07 
Rate at 8 °C: 
± 0.2 
Rate at 38 °C: 
± 0.2 
Rate stability: 
0.05 
Dynamic rate: 
± 0.05 
Temporary effect of mechanical shocks: 
± 0.05 
Rate resumption: 
± 0.05 
Residual effect of mechanical shocks: 
± 0.05 
200 shocks equivalent to 100 G (981 m/s˛, 3,217 ft/s˛) 

Day 
Position  t[C]  Add. Test 
0 
DU  23  
1 
DU  23  Mech. in op. 
2 
DU  23  
3 
DU  8  
4 
DU  38  
5 
DU  23  
6 
DU  23  
7 
DU  23  
8 
DU  23  
9 
DU  23  Mech. Shock 
10 
DU  23  
11 
DU  23 
DU 
Számlap fent 
Mechanikus  Kvarc 
Mechanical  Quartz 
Basis 
LMET(*) and SLME(**) test timepieces 
Standard 
DIN 8319, which specifies a fifteenday series of tests. 
Positions 
The accuracy of the candidate's rate is tested in five positions 
Temperature 
All watches are tested at 
Measurement 
The results are measured every 24 hours, 
Complications 
On the tenth day of the test, any possible complications are activated 
Criteria 
In each of these five positions, its 
Specifics 
Two special features of the German norm stipulate that 
* 
LMET  Das Landesamt für Mess und Eichwesen Thüringen 
** 
SLME  Sächsische Landesamt für Mess und Eichwesen 
3U  6U  9U  12U  DU  BU 
3 fent  6 fent  9 fent  12 fent  Szlap fent  Szlap lent 
Designation 
Unit  Class1  Class2 
Average daily rate (G) 
s/d 
4 <= G <= 6 
5 <= G <= 8 
Average value of absolute amount of 
s/d 
V <= 2 
V <= 2 
Rate deviation (Vmax) 
s/d2 
Vmax <= 5 
Vmax <= 7 
Difference betwee rates in horizontal and 
s/d 
6 <= D <= 8 
8 <= D <= 10 
Greatest spread of rates (Pmax) 
s/d 
Pmax <= 10 
Pmax <= 15 
Temperature depenency of rate (C) 
s/(d*K) 
0.6 <= C <= 0.6 
0.7 <= C <= 0.7 
Return to rate 
s/d 
5 <= R <= 5 
6 <= R <= 6 
Designation 
Value  Unit  Requirement 
Average daily rate 
Gd 
s/d 
0.3 <= Gd <= 0.1 
Standard deviation of daily rate 
SG 
s/d 
SG <= 0.05 
Speed of rate deviation 
A 
s/d2 
0.003 <= A <= 0.003 
Temperature coefficient C1 
C1 
s/(d*K) 
0.04 <= C1 <= 0.13 
Temperature coefficient C2 
C2 
s/(d*K) 
0.06 <= C1 <= 0.04 
1  100 
5 
101  200 
10 
more than 200 
20 
Block 
Activities 
1 
 Put on the watch  Dress  Breakfast 
2 
 Put on jacket 
3 
 Car journey 
4 
 Arrive at the office  Remove jacket  Read newspaper  Check mail  Make phone cals  Working session as speaker  Take files  Do filing  Walk around the company  Sit down at a desk then get up again  Have coffee  Put on jacket 
5 
 Remove jacket  Lunch and chat  Take a walk 
6 
Repeat block 4 
7 
 Car journey 
8 
 Change  Exercise  Change back Car journey  Take a stroll 
9 
 Have a quiet family meal  Read  Undress  Remove watch 
10 
 wear it all night 