MIMF

How do you create the old Harmony egg shell lacquer finish that was used on H-162 and H-165 acoustics from the 50's?

What do you mean by "egg shell" finish? Are you referring to surface texture? If so, it is probably the result of no final sanding and buffing, just leaving the 'texture' of the finish as sprayed. Orange peel is another example of this.

No, I am referring to the actual finish, not the surface of the guitar. Old Harmony acoustics have a translucent finish, not quite clear, a bit 'milky'. When you repair the guitar and sand through the finish , it is nearly impossible to match the old look. I don't think is just from age, but rather in the finish that they used. It has the effect of a milky varnish stain, somewhat similar to an old telecaster finish..but not so much color. Every H- 162 and H-165 has this characteristic. I'd like to hear from someone who understands what I am describing. IE. someone with actual restoration experience with this specific instrument. I want to avoid a full strip and re-finish. If you haven't done this then please don't speculate.
thanks
Jay

Jay, speculation by someone with Mr. Lewis' experience is better than actual usage by many others.

Besides, I doubt you will find anyone with direct experience with those two obscure guitars. And as Michael said, eggshell is a term used in the finishing industry for a satin surface sheen, which is likely what you are dealing with.

Kerry Char is someone you could ask if you don't find an answer here. I looked around for examples on line and didn't see anything that gives any insight. Either the finish aged in some way or they added something to the clear lacquer to get that effect from the get go. I suggest you experiment with adding some pigments until you get it about right and let us know what you did. If you want us to tell you then it would be helpful to post a photo of the guitar in question. These were cheapass guitars that probably weren't considered worthy of restoration until quite recently. Don't expect to find a highly qualified restoration expert lurking in the wings just to help you through your personal challenge. Maybe we can help and maybe we can't but try to show a little respect.

As far as I know, these guitars didn't use anything to make the finish cloudy or semi-transparent. They just used a couple of thin lacquer coats and did not worry about grain filling too much. If it cracked and aged, that was just time doing its thing. Dan Erlewine has videos that show how to make a new finish crackle. It might also help if you could show a photo or two of what you are looking for. I have a few old Harmony guitars around here myself.