" My opinion the marble is Alley" then you say..."The Heaton white base, green and oxblood pictured is one of the best versions of these that i have seen from Heaton" so according to you the better book is American machine made marbles, with that in hand, please look on page, 77, under ID tips, it lists green oxblood white base, also black oxblood white base. So the bottom line here is what you yourself deem as oxblood, not what others look at it to be. Oxblood was both intentional and accidental. and the term 'oxblood' and pigeon blood are not new terms in glass. they have been around a long time before machine made marbles. LOL and different companies had different oxbloods.
and this is way OT from the original post, but if it walks like a duck and quacks like a duck, it just might be a duck.