  Hubble Space Telescope observations from December 11 2015 detected the
expected fifth counter image of SN Refsdal at $z = 1.49$. In this letter, we
compare the time delay predictions from numerous models with the measured value
derived by \citet{Kelly2016a} from very early data in the light curve of the SN
Refsdal, and find a best value for $H_0 =
64^{+9}_{-11}~\mathrm{km~s^{-1}~Mpc^{-1}}$ (68\% CL), in excellent agreement
with predictions from CMB and recent weak lensing data + BAO + BBN (from the
DES Collaboration). This is the first constraint on $H_0$ derived from time
delays between multiple lensed SN images, and the first with a galaxy cluster
lens, so subject to systematic effects different from other time-delay $H_0$
estimates. Additional time delay measurements from new multiply-imaged SNe will
allow derivation of competitive constraints on $H_0$.
