It's fully explained in my how-to guide.So they way I understand part of it is Federal used a alphanumerical month system.
A=January
B=February
C=March
and so on, right?
Dome shined up quite well after scrubbing with some wet aluminum foil. Still gotta fix up that crack though.Still got a good deal on it. That skirt is going to need some serious TLC but any Model 17 for less than $100 is a good buy. 'Fraid I can't help you with the age but I know a few people here know how to pinpoint its manufacturing date via the serial number.