Originally Posted by rdecator
need to know if i can use modern ammo under grips it has d20800 top of barrel iver johnson arms & cycle works fittchburg mass usa bottom of handgrip pat. june 16 96 aug 2? sep16 04
Welcome to the forum. The D prefix was used two different periods on large frame Hammerless .38's but those patent date markings indicate a third model made in 1910 for smokeless powder .38 S&W ammo. It should have a coil type main spring.
The last two dates should read AUG.25.96 and SEPT.6.04