I bought my first metallic bench planes today(been usingtransitionals for a while now.....uggggh...I hate 'em) Anyway, I got a 606 type 6A from 1922, according to this site
http://www.antique-used-tools.com/brtypes.htm, and a Sargent 409 with 97-98% of the jappaning left. The 606 is about 85% jappaning and it has a Sweetheart iron. I'll have pictures soon, real soon.