First of all Tom, Welcome . I have some good reading about Die Deterioration Doubling : https://en.wikipedia.org/wiki/Die-deterioration_doubling
@Tom Arrasmith. Welcome to Coin Talk. I don't think it's a DDO but if you want to double check, Wexler has 19 DDOs' on his site: https://doubleddie.com/2474337.html
Also, if they are part of the variety, markers need to be heeded as well. If the other markers are not there then it isn't the DDO/DDR... Unless a variety which hasn't been attributed yet... Markers are important too...