The Remington Model 11-87 was manufactured from 1987 onwards, and to determine the specific manufacture date for a particular serial number like 444542, you would typically need to consult Remington's serial number lookup resources or contact their customer service. Serial number databases often provide information based on the specific range of production years for each model. Without access to those resources, I can't provide an exact date for that serial number.
1920
That is not a serial no of a Remington 1911A1 they stopped in 1945 with 2465139.
I checked www.oldguns.net and they show the manufacture date of Remington 1903A3 serial no. 3851292 as 1942.
RW isn't part of the serial no, it stands for Remington Works 1915
1912
1920
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1923
1912
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1919