The Model 10 was never recessed, as I understand it. The last Pinned models were the 10-5 (standard barrel) and 10-6 (heavy barrel).

You've got it right with the 19-4 and 29-2 being the last P&Red models.

I'd say the 19-4 is probably my idea of the best revision of the 19, since its gas ring is on the cylinder rather than the yoke (my 19-3, with is gas ring on the yoke, accumulates crud inside the yoke/cylinder and makes the cylinder hard to turn).

The 29-2 and earlier 29-3s did not have the "Endurance Package" and would reportedly shoot loose with a steady diet of heavy magnum loads (I don't know how true this is). The 29-3E and 29-4 and onwards have the endurance upgrades, so they'll work better as shooters.