Now I think you may be after 18th century but Eureka do make presiduals in 15/18mm and they look very nice possibly a touch pricey
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Yes 1700's in New Spain (California and what today is the American Southwest) - Edit: plus Zorro in the late 1700s or early 1800s - depending on what story line one prefers - but I may order some to see about converting them.
Most gamers here are 25+ mm oriented and it may pass without too much question.
Ideally would have mounted and dismounted versions of the same figures but that may be extremely unrealistic.
I really like the Soldados from Dayton Painting consortium but if I can do the figures in 15 mm it would be a good pace saving change.
Gracias,
Glenn