The Marshall JCM 900 4500 (50-watt "Dual Reverb") is an all-tube guitar amplifier head introduced in the early 1990s, aimed at providing high-gain tones for rock and metal players of that era.
Known as a 90s staple for metal and alternative rock, the 4500 is the 50-watt sibling to the 100-watt 4100 model.

Key Features and Specifications
Power: 50 Watts (switchable to 25 Watts via switch on the back).
Tubes: 3 x 12AX7 preamp tubes and 2 5881 (aka 6L6) power tubes.
Channels: Two channels (A/Clean and B/Lead), both sharing the same EQ section.
Reverb: Built-in spring reverb with independent controls for each channel.
Effects Loop: Series effects loop with sensitivity controls.

Recently serviced with all new JJ Tesla pre-amp and power tubes.
No scratchy pots and sounds fantastic.
Very good condition.
Included is a 2-button footswitch for changing channels and switching reverb on and off.
Also included is a zippered bag with handles for storage and transport.

As for shipping and insurance, I won't know what it will cost to ship from Arizona to where you're located, so once you make the purchase, and before I buy a Reverb shipping label, I may have to ask for more to cover the difference.
I will include screen shots for evidence.
At that point you can agree to spend the little extra or ask me to refund the purchase, no harm, no foul.
Of course I will refund you something back if it ends up being less too.
I'm fair and honest about it.