I think I've answered my own question. Based on the leaves, this looks to me to be another example of a Rosa Rugosa, but with a double bloom. Yes? No? - David
Yes, I'd agree with that. Possibly Rosa 'Belle Poitevine' (which is a rugosa-type rose with double deep-pink flowers). Rosa 'Belle Poitevine' from "A Southern Garden" Rosa 'Belle Poitevine' from Peter Beales Roses (commercial site) By rugosa-type rose, it is meant that the rose is similar enough to Rosa rugosa that it is almost certainly in its hybrid parentage, but the hybrid crosses are unknown, and so instead of Rosa rugosa 'Belle Poitevine', the rugosa is dropped and only the cultivar and genus name are kept - but for record-keeping sake, the RHS Plant Finder adds a (Ru) signifying rugosa type.
Thanks for the confirmation, and the pointers. I think you're right -- I found a larger photo of the Rosa 'Belle Poitevine' and it seems like a very close match. Rosa 'Belle Poitevine' Your interest in my flower mandalas has gotten me back on the path of making them. Thanks again - - David