Seamaster 300m ref 2220.80

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Yeah that makes sense reading through that post. Given the ref number and date wheel font I’m assuming it’s a D


If that's the watch I'm thinking it is, losing 22 seconds a day almost certainly means it will need a service right away. I also think it's a C.

This is a D. Both the C and D have a serif 1 but the D serif is longer and thicker. (That's what she said!)

Edited:
 
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Unfortunately I’ve got the first few digits- 81745
Serial beginning with 81 would be a C. D's are 84 or 85 and higher.
 
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Thanks, you’re right, that is the watch I’ve been looking at and got spot on the 22 secs a day.