Greetings and mich paul and welcome aboard,
You haven't given much to go on. Let's see, it can't be the Model 1889 because the serial number is too high, same for the Model 1894. The Model 1900's were made with numbers in the 300000 to 399000 range. The SPR210 and SPR220 are both 21st century guns that are way too new to be grandfathers.
My guess is that you have a Remington Model 1900 SxS. They were offered in 12 and 16-ga and in four grades:
K - Remington steel barrels
KE - Remington Steel, auto ejectors
KD - 2 stripe Damascus barrels
KED - 2 stripe Damascus, auto ejectors
The Model 1900 was offered as a lower priced version of the Model 1894 from 1900 to 1910. For a gun that's over a 100 years old, don't even consider shooting it without having it certified first.