It appears to me that is a Miller single trigger.
When the Model 32 was introduced, it was only offered with double triggers. A gun with a three-digit serial number was probably built before Remington perfected their single selective trigger. August 12, 1933, Remington Arms Co., Inc. illustrated price list --
August 12, 1933.jpg
By March 1934, Remington was offering their single selective trigger --
March 1, 1934.jpg