Old Union Locks without Keys, how to find key code..?

[JohnD]

This is above my pay grade, but levers are available to purchase.

Levers - Components - Locksmithing Tools

www.aldridgesecurity.co.uk

I have no idea if asking a decent locksmith to convert the locks into key alike (for example) would be more expensive than just buying new locks.

It would. The sets retail at around £20-£30

You can buy a decent copy lock, new, made by Zoo, with two keys, for about £18

With practice, you can swap the levers yourself, and get a new key to suit, but I have never seen lever sets for a cheap lock like the one here. The ones you link are for BS3621 5-lever locks. Even then, VFM is doubtful, unless you are in the trade and go round changing locks in shops and offices every time a manager leaves, and it saves you carrying crates full of new locks.

I keep some spare levers removed from Chubb locks, to rekey my own, and can decode keys and levers. If I have to buy new levers, they cost around £3 each.

 

[JohnD]

This is the exact lock measurements.
Union 2077 3 Lever Horizontal Mortice Lock - 124cm

so if you measure you own, precisely, in inches, I think you will find it measures 5", 2", 4", 1", 1/2"

the metric numbers are a conversion, and near, but not precise.