If selling, I would ask$1,000 and take $750.

Rare doesn’t mean valuable. It’s only worth what someone is willing to pay. I’d guess maybe $1k. It’s all subjective. Honestly, if you were close by, I prolly wouldn’t offer more than 750 tops as well.
Gottlieb 70s drop target games seem to go for more in about the same shape as they have more going on with them. And they are plentiful.

My friend just sold his for 1700.00, fully restored and shopped.

Hmm i really like Zaccarias. And the EMs are generally rare. A combat is quite rare and its a very good game. So for a game in working condition i would consider 1000 $

But your game is not "working condition". It looks to be the best condition of any zac EM in existence! The cab is so nice looking and the playfield is like mint. Look at all the parts and plastics, bumpers etc. And under playfield also mint.

Of course there are not many interested but there might be a few hardcore collectors appreciating such a gem. I would not let it go for under 2500. I know that sounds crazy and thats only me but the game condition is also quite crazy

My two cents. I’m guessing most decent shape EM’s are going for around $1000 right now give or take. This is more rare and really nice shape. But, being a Zac might scare a few people off too because they are unfamiliar. I would say to the right person, in the $1500-1700 range would be the place to start. See if you get any nibbles. Arizona may hurt you because of shipping. I have one also, so I will be watching!

Personally, I wouldn't say "flawless". There are a bunch of minor dings and scratches, in addition to the backglass issue. So, I would call it exceptionally nice instead so as not to mislead anyone.

The only sale recorded in the marketplace: https://pinside.com/pinball/market/classifieds/archive/77457

$1500 in 2019, sold after 10 days.

I didn't spot any other recorded sales on other sites.

A very rare title, but I don't think it's a very hot one.