Look at the coinage of Elizabeth I for an unambiguous contemporary example. The top sections of the "5s" vary substantially-- some are nearly square, some are

Look at the coinage of Elizabeth I for an unambiguous contemporary example. The top sections of the "5s" vary substantially-- some are nearly square, some are an obtuse angle which looks not that far from this figure. The Arabic numbers took a long time to standardize-- you were still seeing the weird early "4" that looks like the nodern one tipped back 45 degrees not that much earlier.