[lugerholsterrepair]

Richard, Is there any indication of what's in it? Leather dressings have many purposes. Keeping off water & mud, dirt etc. Many are not appropriate for a statically used/displayed antique historical artifact.
Then there is the purpose for which you want the dressing..to shine? Prevent cracking? Soften? It is important to know the ingredients to determine what it will achieve, what you expect it to do.
It's also possible to put different potions on different parts..one for say the hinge, top of belt loops, closure strap and something else for the hard molded surfaces.
There has been a lot written on this subject both here and on Jan Still's Gunboards.