I received a response from Remington this morning. Here it is:
Recently you requested personal assistance from our on-line support center. Below is our response.
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Mohawk 48 Shotgun Question
Response (Chris) 12/11/2009 08:38 AM
According to the serial number that gun was produced in 1970. We do not have any further details on that serial number but it is possible that it can originally chrome. The Mohawk 48 was in production from 1970 to 1974.
We hope this information is helpful. Thank you for contacting Remington.
12/05/2009 12:57 PM
I recently bought a Remington Mohawk 48 shotgun. Serial number 5253647. It appears to be chrome. Can you tell me anything about it and if it is actually chrome?
I've included several thumbnail photos if that helps.
So I guess I can safely assume it's chrome.