It appears a gang followed coin and jewellery dealer Lloyd Bennett as he drove back to Monmouth from the event at the Motorcycle Museum on June 8.
When he reached Ross-on-Wye, he suffered a puncture and stopped at a garage to find a knife had been used to slash the tyre.
He was then approached by a young foreign woman who was wearing a veil and appeared to be trying to distract him by asking for directions.
After replacing the tyre, he drove home to Monmouth where, after briefly leaving the car parked, the thieves smashed a window and took a black box full of jewellery.
The method used was the same employed by the gang who stole over £150,000 worth of antique coins from Dix Noonan Webb after the Coinex fairs last September and also previous thefts where dealers were targeted in London’s Hatton Garden.
The items taken from Mr Bennett’s car included a sovereign or coin purse of 18ct gold priced at around £1000. The purse, in two colour gold mesh is embellished with diamonds and rubies.
Other items taken can be seen on www.jewellerywindow.com
Anyone with information should contact DC Martyn Coombe of Abergavenny CID on 01633 838111, quoting the crime reference number BM/562/08.
