Thanks very much for the recommendation, i'll definitely keep that in mind.
It does now seem fairly certain to be type Baker 62B, with the second obverse combined with the original Reverse Die, struck Circa 1850. Still a choice example, I've had diverging valuations from $1700 - 2500 based on that. Decided to put it in with a load of other listings on my eBay at a bit of an inflated price with best offer - see if it gets any interest in the short term, if not i'll probably consign it as suggested.
Thanks again for pointing me in the right direction on this one,
Jeff (London, UK)