ChrisKelly

That's cool!

Preserved properly, displayed properly, further corrosion shouldn't be a problem. I'd leave them alone. Application of anything on the core of those Iron Crosses could cause what's left of the black finish to flake off.

My understanding is that they're actually Spanish manufacture. They look fake, but they are genuine, although not of German manufacture.

Both are slightly vaulted.

Looks like a Weimar Era cross, high-quality "jeweler-made" example. Likely a solid silver (.800) frame. That is a really nice example, and absolutely genuine.

Brass or more likely tombak. My understanding is these Iron Crosses were struck primarily for kriegsmarine personnel. Iron can corrode quickly in the salt/saline environment that is the Atlantic, so these were more resistant to rust and degradation.

I found these sources. I hope I got the correct medal. https://booksfrombulgaria.com/bg-ordersandmedals/pavlov.htm https://katzauction.com/lot/540341

Sources: https://www.warrelics.eu/forum/bundeswehr-forum/57er-2nd-class-luftschutz-medal-389044/ https://gielsmilitaria.com/index.php?route=product/product&product_id=19846 https://www.weitze.com/militaria/44/Luftschutz_Ehrenzeichen_2_Stufe_Ausfuehrung_1957__465144.html

Which ribbon is correct? Sources: https://www.relicmilitaria.com/product/bulgaria-medal-for-participation-in-the-anti-fascist-struggle-partisan-medal/ https://www.ebay.com/itm/125026447688

One of the most common, and least expensive Reichsluftschutzbund tinnies... Source: https://www.militariasales.com/?s=Luftschutz&post_type=product&dgwt_wcas=1

Reichsluftschutzbund (RLB) tinnie. Likely pre-1940, as it's tombak.

Just a guess... Looking at the crown on the guard, I think it's a German naval/maritime sabre from the time of the kaisers. Not my bailiwick, but a really cool, neat sword. No, I've never seen one like it. It may be custom made. Can you get any more images (especially the blade, and a scabbard, if it has one)?

Some extras... Hope it helps. Sources: https://www.medalbook.com/europe-east/poland/polish-peoples-republic-1944-1989/orders/order-of-the-cross-of-grunwald/order-of-the-cross-of-grunwald-iii-class-3 https://www.identifymedals.com/database/medals-by-country/poland-medals/the-order-of-the-cross-of-grunwald/ https://archiwum.niemczyk.pl/product/157273/prl-krzyz-grunwaldu-iii-klasa-miniaturka https://www.warrelics.eu/forum/peoples-army-poland-ludowe-wojsko-polskie-1943-1989/grunwald-cross-krzy-grunwaldu-opinions-546975/ https://www.easyliveauction.com/catalogue/lot/ec3dca0187dbe42cd5635cecc31f27ed/0af8d24542e81eb9357e7ef448a6646f/medals-militaria-and-firearms-auction-online-bidding-lot-10/ https://wcn.pl/archive/303676?search_in=name&search_what=kwartnik+Kniprode&page=3021

Looks genuine to me. Privately converted from a pinback.

Here's one for sale. Price is $850USD. Whether or not it's genuine, I don't know. Source: https://griffinmilitaria.com/product/luftschutz-civil-air-defense-decoration-first-class/

My latest acquisition. This is an early "lightweight" (non-zinc) type. The ribbon is sewn together at the top, but missing the pin on the reverse. The suspension ring is not welded nor is there a hallmark on it.

https://www.wehrmacht-awards.com/reserach_tools/ldo.htm https://www.lakesidetrader.com/Education/Maker-Mark/ https://www.derfreiwillige.com/new-page

28 mm across with 55mm knurled pin. Hallmarked "Ges.Gesch." and "FBH".

https://germanhelmetvault.com/luftschutz/

https://www.germanmilitaria.com/Luftwaffe/photos/L019989.html

Sources: https://www.germanmilitaria.com/Luftwaffe/photos/L007488.html https://www.germanmilitaria.com/Luftwaffe/photos/L011989.html https://www.germanmilitaria.com/Luftwaffe/photos/L008787.html