I have two third model .44s. This one shipped in March 1931. It is wearing a pair of Kurac smooth Magnas and a Pachmyar grip adapter.
The second one is the oldest known third model surviving. According to Roy Jinks, the first third model was # 28358. This one is # 28363. It was in the first shipment of 1926 .44s sent of to Wolf & Klar in January 1927. All 75 of them were 5" nickel.
This revolver is wearing correct, but not matching, service grips. It went back to S&W in February 1942, when it was renickeled and received new grips.