VIdeo of my amp, my buddy tested it
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NOTE: Shipping cost, time, payment 
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Shipping cost is just an approximation, please ask for it before bidding. I encourage to get it locally though if you have friend in Poland. 
Lately I've moved out and I am looking for a flat, so I temporarily borrowed some of my amps to my friends. Note that it might take a week for me to prepare some amp for shipping - I need to get the amp back, test, pack, it usually happens at weekends.

Wire transfer preferred, in PLN, or in EUR, in the worst case in GBP, though paypal is acceptable.(paypal has 3-4% fee). I can list it for less if you dont want paypal.

If it comes to UK, my buddy sometimes goes to Bedford, so it might be possible to collect in in person on rare occassions.

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The item is located in Wroclaw, Breslau, not far from Germany, can be tested locally.

Diezel Herbert, MKI, PCB v1.8
Hardshell case included

Previous owner bought from Diezel set of JJ KT77 tubes one or two years ago and put 12ax7 china on preamp. I've replaced V4 after some time to other china tube.

Tubes make quiet "pop" sound when warming up, but it's not noise which is amplified, anyway most of my amps do the same, especially when turned off.
Visually looks quite ok.

Rear panel screws might be missing, I always loose them.

I have Einstein x2, VH4, Herbert and DMoll. I like the Einstein, VH4 - i still need to test it properly, I might sell it, but the other amps, including Herbert, are for sale.

It has quite wide flat frequency range, lot of quite tight bass (tight compared to some Diezels).

Modern "evil" souding. 
The part I didn't like is that I like cutting/pushing mids, this one is flat in frequency so you dont feel mids like in Marshalls. 
Einstein is closest in this manner I think. 
VH4 also has punchier mids, though does not sound so pleasant as Herbert.
I also have Elmwood Modena which is a little simlar (though more like a Mesa Rectifier), and I don't have space/need to keep all of 5 Diezels ;)
Basically I'd say it sounds more like 6l6 amp compared to others.
Mid cut is very versatile. Sound better at high volumes, I play on low volumes.

Some lame videos:
https://www.youtube.com/watch?v=YBhje51c-sQ
https://www.youtube.com/watch?v=DUMfaWRy1hE
https://www.youtube.com/watch?v=oJWaxosSAIQ
https://www.youtube.com/watch?v=fcs3pIkUB9U
https://www.youtube.com/watch?v=K359qLr6Rsw

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Looking for gear
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I already own 20 amps, hard Gear Acquisition Syndrome ;)

I am mainly looking for:
- Ceriatone Chupacabra, Yeti, King Kong (though lately prices are quite high imo), Mako Mak4, Mak2 Dorado, Peters, Baron, Landry G3, Diezel Lil Fokker, new version of VH4 (already own old one), PRS SC, singlecut

Basically looking for aggresive, high gain amps.
Less likely:
- Bogner 2x12 oversized
- VHT 4x12 slanted or 2x12, maybe some Splawn cab, though usually shipping is expensive so I am not sure if it will work
- Splawn
- Yamaha SG700, 1000, 2000, Ibanez AR2000, Jackson SLSMG

Here is some website on which I listed gear I am looking/not looking for:
http://alseic.github.io/zamiany/index.html