Is it Nickel or Chrome? My 1936 catalog states that frames were available with a Chromium head tube and fork. Earlier bikes would have been Nickel plated of course (not sure what date the first chrome plating was done on Ivers.
Could have been a trainee stamping serial numbers that day, or someone hired away from the Columbia MFG., Co.
Early Ivers had bottom bracket serial numbers but lots of other things on your bike point to a later model. Badge is post 1921. As far as the entire bike being plated, it could be they just dunked the whole thing and then painted everything but the head tube. I posted a Nickel plated Iver in the Solid and Stolid thread that was on eBay months ago. I don't know if it sold but it was pretty cool looking. Be sure to post photos of your bike in that thread for longevity (it's in my sig line)