The earliest Parker Bros. 28-gauge in the surviving records is a BH-Grade serial number 94373, followed by two DH-Grades serial numbers 95431 and 97170. There is a body of evidence that about 1900, the Brothers P took several 0-frame 20-gauge guns that were languishing in inventory and fitted them with 28-gauge barrels in an attempt to move some inventory with a new novelty.
Remington Arms Co.'s Model 1893 single barrel was being offered in 28-gauge a year or two before the first Parker Bros. 28-gauge doubles.
