SPI's "ModQuads" were some of my favorite games for a long time. Still hold up remarkably well....
Modern Battles (I) published in 1975
Had 4 games in it. Counters were silhouettes. 2 of the 4 were actual battles that happened, while the other 2 were hypotheticals
Chinese Farm -
not in China, but rather Israel v Egypt in '73
Würzburg - A favorite of mine, obvs hypothetical
Also makes an appearance in
this battle lab article about recon units and wargaming
Golan - Another actual battle, and again from '73, but at the other end of Israel
Mukden - What was then a rare hypothetical - Sino-Soviet combat, including paratroopers
Modern Battles II published in 1977
Had 4 games in it. Counters were NATO symbols, and only 1 historical battle. All the hypothetical games had "untried" unit sides for greater fog of war before the battles started
Bundeswehr - double-rarity: it's a rare wargame designed by a woman (decades before Kai Jensen, Amabel Holland, and Rachel Simmons, among others, would cut loose on wargame design); it's a rare NATO-vs-Red Horde CWGH game with -
no- Americans in it. It's all Germans + Brits vs the Warsaw Pact in Northern Germany
DMZ - Hypothetical Korean shooting war in the '70s, later redone/updated by Decision as a folio game
Yugoslavia - 3 major factions: Russians, NATO (US/Italy), Yugoslavians. Depending on the scenario, the Yugoslavians side with either the Russians or NATO, and a rare 3-player scenario, too.
Plus the prescient Yugoslavian Civil War scenario that splits their army into Serb/Croat factions
Jerusalem - The only historical battle in here - 1967 - and the only one with untried units, since historically they were, y'know...
tried and we know what happened. Also had multiple nationalities on the "Arab" player side: Jordan, Egypt, and Iraq
Gonna end up adding some other posts to this thread w/ attachments and links...