Hi Paul,

have a look at the data from the GCVS, you have send:

>Comments from the GCVS:
>
>Right ascension: 19h24.5510m
>Declination: +50.2416 deg
>Cause(s) of variability:
> Z Andromeda type
> Semiregular long-period type
>Click here for SIMBAD data
>Photometric band: V
>Maximum magnitude: 5.60
>Minimum magnitude: 8.49
>Spectral type: M7IIIab+Be
>References: 08849 00002
>
>AAVSO designation 1921+50 ; available charts are:
>q scale chart, made 3/91; field of view is 8 degrees
>

According to "The Night Sky Observer's Guide" a "Z Andromeda type" of
variable star is a "Symbiotic variable", which can have an amplitude of 4 -
5 mag. during the outburst. The period between the outbursts is 1 - 3 years.
So maybe you observed this star just at the right time :-)
I think, there are some experienced variable star observers among the
guide-users, which can give you more informations and can confirm your
observation.

Clear skies,

Oliver