I have a 6 inch chrome M&P with serial number 611108. According to Roy mine is one of 10 revolvers that were assembled in 1937 with chrome finishes. These guns were used as samples by the salesman from that point forward. Also, according to Roy, at least 6 of these guns were shipped to to Mr. Harvey D. Rush of Kansa City on the advertising account. These guns were ordered on 11-27-41. They were to be shipped to Mr. Rush, delivered for testing and then returned back to the factory.
1- 4 inch #612726
3- 5 inch #611189, 614434, 614613
2- 6 inch #622295, 622398
According to Don's information and Roy's there are two consecutively numbered gun in the bunch, 614435 and 614435.
My gun, 611108 was shipped to Mr. Rush in 1938 and then returned back to the factory for a number of years. It then shipped to Charles Greenblott co. in September of 1960.
One thing that makes a chrome gun easy to distinguish from a nickel is the hue. A chrome gun shows a blue hue as a nickel gun has a yellow tint. Just in case you stumble across one......
Don, send me your fax# or email and I will send you the info I have if your interested.
Chad Gripp