Due to insufficient evidence of record, this case is remanded for a full and complete hearing on the Commonwealth’s petition for extension of time under Pa.R.Crim.P. 1100(c). See Commonwealth v. Ferraro, 268 Pa.Super. 211, 407 A.2d 1320 (1979); Commonwealth v. Clark, 256 Pa.Super. 456, 390 A.2d 192 (1978); and Commonwealth v. Krall, 249 Pa.Super. 433, 378 A.2d 373 (1977).