BSR Transition Period Piece?

My understanding of the timeline has always been that BSR started using the DISA automated molding machines, whose patterns had this style of markings, in 1966. Prior to that, other automated molding machinery had been in use since the 1950s, and those patterns are the ones with the size number and pattern letter, but in a neater font than the old hand-inscribed look of the hand cast Red Mountain pans. Century was just a rebranding in 1954 unrelated to any switch to automation or type of machinery. I do agree that this configuration of DISA-style marking is unusual. Normally seen is NO. 10 above 12-7/16 IN. at six o'clock.
 
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