The only evidence of cold-worked hardening shows up at the raised rim. I don't think the central details were ever struck into the planchet on a prior strike of what we recognize as a double struck coin. I think someone backed the hammer die off a "kissed" un-centered planchet before centering it and striking it completely after that.
It looks like the die may have been tilted at an angle, please note the weakness on the leafs on the left side of the coin on the reverse compared to the ones on the right side. Its a great looking coin!
It looks like it might be a double strike to me, too. Maybe @Fred Weinberg would know. Nice photos, Larry! Chris
I don't think there's any doubt it was struck twice, but that would not fully account for what we see on the coin. My guess is the collar was loose and contributed to what we see. Either that or the dies were badly misaligned. But in either case it was still struck twice.