All About Pocket Knives

Picked this up recently. Very very clean. If ut was used it was do e so very lightly.

Any idea on age ? I know they were made between 1920 and 1940 but is there a way to narrow it down anymore ?

I realise the circle shield higher end models had some date ranges associated but what about the line models ?

Thank you

Not a Remington expert by know means, but I do know the straight lines were made in the later time frame like after the great depression. Most of the straight lines were made by other company's for Remington.
Nice knife by the way

Very nice