Ok, here's a contribution which will give you a reference point.
It's my Record A151, which was bought in 1988.
It has smooth, light blue paint - there's no checkering on the handles. It was definitely made in England - that's in the casting, next to the model number.
And its lever cap has the later style. Now I think about it a bit more, this change does look like a bit of the sort of cost-minimising thinking likely to have come in in the 70s or 80s. When the model number was in the casting, Record would have needed to hold stock of functionally identical parts with different numbers on. Swapping to one standard cap and marking as needed would have made a tiny reduction in stock holding cost. I think the numbers were stamped, not engraved, judging by the way the metal is bumped up around the lettering.
One other point - there wasn't really any production of Record hand tools in the 21st century.
The last few years of the company can be summarised like this (info mostly from
Tweedale's Directory of Sheffield Tool Manufacturers 1740-2018.)
1972 - C&J Hampton - peak turnover (£4.3m) and workforce (900). Bought William Ridgway & Sons to form Record Ridgway Group.
Internal reorganisation - Record Ridgway Ltd was the operating company. Bought Platt Forgings at Willenhall and built a new foundry at Parkway in Sheffield.
Profits were in decline. Platts was sold off. In 1981 Swedish firm AB Bahco took over Record Ridgway. In 1985 a management buyout restored British ownership. Hand tools were branded Record Marples in this period.
In 1998 the company was bought out by American Tool Companies Inc and became Record Tools Ltd. In 2003 the American owners became Irwin Industrial Tool Co, who continued to sell tools branded with the Record and Marples names (sometimes alongside the Irwin brand) but by this time UK manufacturing had ceased. The Record site at Parkway is derelict. (
https://www.derelictplaces.co.uk/main/i ... 013-a.html)
The US firm Irwin was briefly owned by the Rubbermaid group, who moved US production to China. In 2016 Stanley Black and Decker bought the business. (
https://en.wikipedia.org/wiki/Irwin_Industrial_Tools)
So since 1998, unless they were old stock, tools marked with any of the old, trusted UK and US brands of Record, Marples, Ridgway or Irwin could have been made to any design, in any country. Not at all the same as when the Hamptons were in control and built up the Record brand.