Picked up this 201# arm and hammer to start making stuff with my young sons. Anyone have some date info or anything else on this one? Looks like number 537 with a K stamped on the left side 

Very nice looking A&H, I'm sure someone with a copy of AIA will be along with info. In the mean time I suggest reading this to get the best out of the forum. READ THIS FIRST

S/N 537 should be from the first year of production, 1900. Looks like its in excellent condition!

There are some missing digits in the photo, or worn away digits in the serial number.

That logo stamp is not from the first year of production.  That is the third style of logo stamp A&H used.

Which was used from when to when---approximately?

I don't have exact years,  Postman's dates jump from 1901 to 1912.

I have serial number ranges for each logo style that I've compiled.

 

I will check it out again tonight and see if I can find some more serial numbers... 

Black frog. Based on third logo do you have a date range for that version of logo? 

Do you guys see any more numbers??? Maybe something before the 5?

Looks like it might be a 3 or 9.

...looks like there's a leading "1" digit, and some other last digit to provide a 15k range serial number.

That 15k range would be appropriate for that style of logo stamp.

Thanks blackfrog is there a date range for 15k? 

1912 ballpark according to AIA.

 

Thanks!!! I appreciate the help. Just cool to know a little about it!!