key for yale lock

[Pschiffe]

As what Pete said or you can look up Antique Steamer Trunk. I found two an call o email to them.....Timothy......
https://www.brettunsvillage.com/trunks/howto/parts/keysfortrunks/
http://www.stevensantiquetrunks.com/trunkkeys.html

Those are good suggestions from Timothy. If you scroll down to the bottom of the Brettuns Village Trunk Shop website you will find the keys he stocks listed, I did not find LH7. If you choose to use the Stevens Antique Trunks search service specify:

1. Lock Mfg.: Yale
2. Key Number: LH6
3. Style: Corrugated

Pete Schifferli