Six inch and 1:10000

ORDNANCE SURVEY OF ENGLAND 
HERTFORDSHIRE
INDEX TO THE PLANS of HERTFORD
On a Scale of ¹/₅₀₀ or 10.56 Feet to a Mile.
Scale of this Index 6 Inches to a Mile. 

Verso has a paper label;

LONDON-
EDWARD STANFORD, 55 Charing Cross, 
AGENT BY APPOINTMENT
FOR THE SALE OF THE 
ORDNANCE & GEOLOGICAL SURVEY MAPS 
THE ADMIRALTY CHARTS,
Her Majesty's Stationery Offfice and
India Office Publications, &c.

labe is pasted over printed wording;

DEPOTS FOR THE SALE OF ORDNANCE MAPS, &c.
ENGLAND AND WALES. 
1, Saint Martin's Place, Charing Cross - LONDON.
SCOTLAND. 
Ordnance Survey Office, Post-office Buildings - EDINBURGH.
IRELAND. 
Ordnance Survey Office, Phoenix Park - DUBLIN.