If you use a fiddy case for the 217, then the caseback will not be accurate. The fiddy caseback has a EXXXX/1950 serial number on it, usually the 0117. The 217 caseback should have a HXXXX/1000 serial number. If that does not bother you, then you could use it.
If you use a fiddy case for the 217, then the caseback will not be accurate. The fiddy caseback has a EXXXX/1950 serial number on it, usually the 0117. The 217 caseback should have a HXXXX/1000 serial number. If that does not bother you, then you could use it.