Saint John Men's Double Breasted Suit

[Titchmac1]

I have a charcoal grey/blue striped double breasted pure new wool suit. It has the name "Saint John, Paris Roma London" on a hand-sewn label on the upper inside pocket and there is a "pure new wool" label tucked inside the lower inside pocket. I cannot find a size in the jacket or the trousers.
Can anyone tell me anything about this please. Thanks in advance.

[DSJ]

Google Saint John men's suits. There's plenty on several websites.