Mantle MM4

I’m a little perplexed and wondered if anyone had an answer to my query, or at least some opinions. There is a Rawlings MM4 Mantle on eBay (sorry to out this auction, but it’s not like it will go un-noticed) that has a patch which doesn’t date to the glove’s manufacturing timeframe. In other words, the MM4 was produced to 1958, but this style patch began in 1959. So, there are a few possible solutions to this riddle; (1) the patch was replaced at a later date, (2) Rawlings ran out of black anniversary patches and began sewing their new patch on to gloves in late 1958, (3) the MM4 production run continued into 1959 or beyond. Is there anything I’m missing here (I’m probably overlooking an extremely simple thing) or perhaps a story someone can tell that would shed a little light on this bewildering subject. 
