Thanks for coming through with all your help.
Although we haven't been able to pin the manufacture date down to a specific, it would appear that this Webley is mid 1964, so only real steel for this one.
The 'orrible tap lever isn't an option


What is another word for sintered?
My Premier has a latch made from that process. Needless to say it has broken and then been brazed by a previous owner and only just fulfills its function; near on completely stuffed