ใด้มาเพิ่มเติมครับ ไม่รู้จริงเท็จประการใด 
1: Black Plates on Original 301 Grey Grease Bearing (Very Early Run): Schedule 51400 Brass and Chrome, painted, lacquered, No forward slash or number just the silver block. 
(Unknown as to the serial numbers when they changed and added the /1 Schedule) 
2: Black Plates on Original 301 Grey Grease: Schedule 51400 /1 Brass and Chrome, painted, lacquered. Beginning of Schedule numbers. 
3: Silver or Black Plates on Original 301 Cream Grease Bearing: Schedule 51400 /1 These plate were made from aluminum glossy and matt. (May be a few early cream 301s with brass plate to use up old stock) 
4: Silver or Black Plates on Original 301 Cream Oil Bearing: Schedule 51400 /2 These plate were made from aluminum glossy and matt. 
5: Loricraft Black Plate on Original 301 any Model: Schedule 51400 /3 These plate were made from aluminum screen printed