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Graf Spee was formidable but she was not a cruiser so I don't think she is eligible. On paper the Japanese cruisers were formidable also but two of the ten gun IJN CAs fought a 4 hour duel with CA25, good old Salt Lake City, one of my uncles was a CGM on her, and it was essentially a draw as far as hits and the IJN withdrew. It was fought mostly at about 18000 yards.
Glider, I believe that the naval treaties in the 20s and 30s defined light cruisers as ships with no more than 6 inch guns and heavy cruisers as ships with no more than 8 inch guns. In addition, heavy cruisers were not to exceed 10000 tons. That would probably disqualify the Scheers on gun size and tonnage although several countries, Germany and Japan, cheated on tonnage. However, a duel between a well handled CA or even CL in poor visibility could have had a negative outcome for the "pocket battleship" I believe during one of the convoy battles on the Murmansk run the CL Sheffield snuck up on the Scheer in atrocious weather and deluged her with 6 inch bullets causing her to run from the fight. The Scheers had armor much like a cruiser and of course they were 4 to 6 knots slower than cruisers.
In a close range gunnery duel, they are not that impressive and in fact may be overwhelmed by a number of other cruiser designs. Long range engagements against this type of cruiser, however, is deadly. Her better firecontroll and armement is telling.
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Its a fair point but the Graf Spee took on the three smaller cruisers and had she stayed at sea could have easily sunk all three of them. She was in all key aspects, undamaged at the end, they were not.
No, if you let me I will stick with the Graf Spee