You cannot "age" this era 32 Hand Ejector accurately. Many models are sold pretty much in order, but when the factory had large inventories, the sequencing by year and serial number went out the window. That is what must have happened to the I frame. Here are some examples:
434XXX - 1926
450XXX - 1941
504XXX - 1941
513XXX - 1929
520XXX - 1931
521XXX - 1948
522XXX - 1941