Split Cane MK IV Vintage Carp Fishing Rod. Possible Southwell

Although I have 6 B James MK1V rods I have not learned yet how to date each rod. What is the secret?

J Peek & Son Split Cane MK IV Carp Fishing Rod. 10'. RARE

Constable Of Bromley Vintage Split Cane Carp Fishing Rod

J A Savory Fine Split Cane Fishing Rods

J Peek & Son Split Cane MK IV Carp Fishing Rod. 10'. RARE

Traditional Built And Split Cane Landing Net, By Dave Austin, For

B James Mk IV Avon, Page 2

Choosing a Split-Cane Barbel Rod

Traditional Built And Split Cane Landing Net, By Dave Austin, For

Split Cane rods, Page 2