I think so too. My Harrison heater has a date of 1956 so I consider it period correct for my '54.
Here's one page off eWillys that list some dates for some of the winches listed:
https://www.ewillys.com/?s=winch+brochureIt may really depend on the dealer and also when that winch might be acquired. When the jeep was purchased or a few years down the road.