Post Your Mid-Year Transitional Coins!

Post your examples of a mid-year design, composition, or value change! Both coins should be issued by the same legal state or entity (or successor state in some cases), and should be the same denomination, or comparable buying power for hyperinflationary issues. To keep things interesting, lets limit it to circulating, non-commemorative issues only. Some examples:

Design:
- 1916 transition from Barber -> Merc, SLQ, Walker designs
- Death of a monarch (Would have to research an example but you know what I mean)
- Designs issued in parallel, such as the Large Cent and Flying Eagle cent

Size or composition:
- 1942 nickel transition from cupronickel to billon
- Canadian cents issued in both copper-plated zinc and copper-plated steel
- Same design used on a large and small coin of the same denomination

Value:
- Soviet 1991 kopek coins, and 1991 coins denominated in rubles following a few months of economic free fall
- German 1923 insane inflation rates

Regime change:
- Any of the WWII occupation coinage
- Conquest or independence (Post-conquest coinage should be made at the same mint in the conquered state)

What does NOT count:
- Commemoratives, patterns, or NCLT of any sort (Sorry, we don't want to see all 50 State Quarters!)
- Coins issued by separate entities--e.g. Indian Princely states, city-issued Notgeld, Conder tokens
- Minor varieties (No WAMs)

And remember that the coins should show off the fact that they were both issued in the same calendar year... they should preferably be dated in the AD scheme using Arabic numerals (1234567890), but I will let the community vote if we want to be flexible on this rule.

I'll need to dig through my collection for my examples, but I will let this thread get started!