Need some help again on 1903 Remington bolts.

About what serial number range/date did the following features appear on Remington bolts?

1. Large "R" to small "R" on bottom of bolt handle?

2. Drain hole in end of safety?

3. Dimple at 12:00 position in safety detent groove?

As usual thanks for any and all help!
Chuck
Information
Warning: This is a relatively older thread
This discussion is older than 360 days. Some information contained in it may no longer be current.