Is this an AltBeacon?

[DPB61]

I am receiving signals from an unknown Bluetooth device with the transmission looking like this:

1BFF75004204018000BC1485CB02D4BE1485A9E44F01000000000000

It APPEARS to be an AltBeacon - it has 1B FF at the beginning and also has the correct number of characters.
However, the Tx Power (Reference RSSI) value is always zero. This message is transmitted about once per second and no bits ever change at all.

The manufacturer code corresponds to Samsung but I guess it is coming from an office nearby as we haven't been able to locate it. Signal strength is pretty constant between -93 & -98dBm so it doesn't appear to be moving like a mobile phone would.

Is there anything in this message format that means it ISN'T an AltBeacon? We would like to exclude it based on some parameter but from what I can see in the spec is does match, with the problem of not giving us any Tx Power in order to calculate distance.

[mdxs]

As I read the https://github.com/AltBeacon/spec, it isn't an AltBeacon since it is missing 0xBEAC as BEACON CODE.