Robert,

I recently finished photographing and indexing the sales records of the Winchester model 21's sold by A&F in 1936. There was only one listed that had a 4 digit serial number beginning 363. It is listed as a Trap grade ejector with 30 inch bbls, weighing 8 lbs, 1 oz (wow!) and choked IC and IM. Does that sound like yours?

Bob Beach