What is the difference between Seiko/TMI/SII “NH” calibers? As of this post there are 10 calibers in the current line...
Comparison
What is the difference between ETA/Unitas caliber 6497 and 6498? Both movements are based off of pocket watch movements....
What is the difference between Seiko caliber NH25 and NH35? There are some differences between these overall similar movements. The...
What is the difference between Rolex caliber 3035 and 3135? The Rolex caliber 3035 was introduced in 1977 as what...